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Top Forums Shell Programming and Scripting remove duplicate lines using awk Post 302492336 by sudvishw on Monday 31st of January 2011 03:59:58 AM
Old 01-31-2011
Hi,
Thanks for your explanation. If I understand it right, suppose we have a file as shown below:
Code:
hi
hi
hii
hi

Here hi comes 3 times.

First time when hi comes, x[hi] will be initialized to 0, which is negated and so it becomes 1 and the line is printed. Second time, x[hi] will be 1, which gets negated and so it becomes 0 and the line is not printed.

If I am not wrong, third time, x[hi] will be 0, which gets negated to 1 and the line should be printed. I think there is something I am missing here. Please clarify.
 

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PPIx::Regexp::Structure::CharClass(3)			User Contributed Perl Documentation		     PPIx::Regexp::Structure::CharClass(3)

NAME
PPIx::Regexp::Structure::CharClass - Represent a character class SYNOPSIS
use PPIx::Regexp::Dumper; PPIx::Regexp::Dumper->new( 'qr{[fo]}smx' ) ->print(); INHERITANCE
"PPIx::Regexp::Structure::CharClass" is a PPIx::Regexp::Structure. "PPIx::Regexp::Structure::CharClass" has no descendants. DESCRIPTION
This class represents a square-bracketed character class. METHODS
This class provides the following public methods. Methods not documented here are private, and unsupported in the sense that the author reserves the right to change or remove them without notice. negated $class->negated() and print "Class is negated "; This method returns true if the character class is negated -- that is, if the first token inside the left square bracket is a caret ("^"). SUPPORT
Support is by the author. Please file bug reports at <http://rt.cpan.org>, or in electronic mail to the author. AUTHOR
Thomas R. Wyant, III wyant at cpan dot org COPYRIGHT AND LICENSE
Copyright (C) 2009-2013 by Thomas R. Wyant, III This program is free software; you can redistribute it and/or modify it under the same terms as Perl 5.10.0. For more details, see the full text of the licenses in the directory LICENSES. This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. perl v5.16.3 2014-06-10 PPIx::Regexp::Structure::CharClass(3)
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